The non-resetting chrono is likely due to the chrono hand being loose on its tube (a common problem on Daytona reps). Have your watchmaker remove the hand & check to see if it spins freely on its tube. If so, he can either crimp it with a staking set or apply a tiny dab of epoxy at the underside joint between the tube & hand
(Original pic courtesy Avitt)
While at it, I would have him check all the other hands as this is a common problem.
Hard to say if your crystal is gen or not based on your pics. If you place the 'gen' crystal next to your original crystal & snap a good, clear macro pic, we might be able to tell. Generally, DW's bezels are slightly too small to fit over a gen crystal since they are made to fit the lighter gage (thinner material) aftermarket crystal that his watches come with. Most here simply remove a small amount of metal around the inner circumference of the bezel & then test fit. If still too tight, remove a tiny bit more & retest. Repeat until the bezel is a snug fit over the gen crystal. It is hard to explain the correct fit, but I usually say it should be tight enough so that you cannot install or remove the bezel by hand, but not so tight that you have to exert alot of pressure when using a crystal/caseback press. Just use common sense.
As far as your new dial, the lack of 'DAYTONA' is actually a good thing. I have a 6239, which also lacks this & that is what makes it so special
However, the lack of 'SWISS' at the bottom is a bad thing since all of the gens have it.